分析:(1)先同時(shí)求出乘法算式和除法算式,再算減法,
(2)先算小括號(hào)里的減法,再算括號(hào)外的除法,再算乘法,最后算加法,
(3)先算小括號(hào)里的加法,再同時(shí)求出乘法算式和除法算式,最后算減法,
(4)根據(jù)四則混合運(yùn)算法則計(jì)即可:先算乘除,再算加減,有括號(hào)先算括號(hào)里面的,
(5)根據(jù)四則混合運(yùn)算法則計(jì)即可:先算乘除,再算加減,有括號(hào)先算括號(hào)里面的.
解答:解:(1)477×85-7784÷56,
=40545-139,
=40406;
(2)28.5+3.14÷(5.128-4.5)×2.5,
=28.5+3.14÷0.628×2.5,
=28.5+5×2.5,
=28.5+12.5,
=41;
(3)7
÷
-(
+2
)×2
,
=7
÷
-
×2
,
=10-
,
=
,;
(4)[(
+
-
)×
÷3]÷[1-1
÷15],
=[(
-
)×
÷3]÷[1-
],
=[
×
÷3]÷
,
=[
÷3
]÷
,
=
÷,
=
;
(5)1
×〔0.625+(4
-2
)÷(1.83+
)〕,
=1
×〔0.625+
÷2.28〕,
=1
×〔0.625+
〕,
=1
×
,
=
.
點(diǎn)評(píng):考查了整數(shù)、小數(shù)、分?jǐn)?shù)四則混合運(yùn)算的順序,注意有括號(hào)的運(yùn)算方法.